2OKM:
reference: Crystal structure of ACE19, the collagen binding subdomain of Enterococus faecalis surface protein ACE., Ponnuraj K, Narayana SV, Proteins. 2007 Oct 1;69(1):199-203. PMID: 17557326

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).